Painting booth



`uly 29 1924.

F. P. BINGMAN PAINTING BOOTH Filed May 1e `1923 2 shears-sheer 1Patented `luly 29, 1924.

UNITED STATES PATENT OFFICE..

FREDERICK P. BINGMAN, OF DETROIT, MICIGAN, ASSIGNOR TO FISHER BODY COR-PORATION, 0F DETROIT, MICHIGAN, A CORPORATION OF NEW YORK.

PAINTING BOOTH.

Application led May 16, 1923.

. Thorough ventilation has to be applied during the spraying operation,to lcarry off the' surplus spray and protect the workmen. This is doneby having air pipes that lead away from the vicinity of the spraying anddraw the air up through the pipes and through stacks to the outside.This draws the fumes and the surplus spray out through the pipes;however, it is found that a large amount of the paint settles on theinside of the pipes and produces a serious fire hazard due to theinflammable character of the accumulations. Furthermore, the air has tobe drawn through the pipes by an aspiratory action. It is impossible toset the fan `directly in the line of draft through the pipes for itbecomes so gummed up with the paint that it would not operate. It istherefore necessary to set the fan in a. branch line and suck the airthrough the ventilating line by an aspiratory action. This re sults in aconsiderable loss of power as a large column of air has to be movedwhich in itself does not ventilate, but simply acts to draw along theVentilating column of air.

Still a further serious handicap is great loss of heat and thedisturbance of the working conditions of the workmen in front of theenameling ovens. The spraying is ordinarily done in the vicinity ofenameling ovens. Under the old system where the fumes and excess paintwas ventilated into the outside air, the hot air is drawn from; theenameling ovens by the suction directly in the faces of the attendantsmaking it almost unendurable. Obviously the heat losses in the buildingare very serious as the heated air is drawn from the building in greatvolumes and discharged to the outside atmosphere.

It is the purpose of the present invention Serial No. 639,285.

to overcome these difficulties and introduce other advantages in thespraying operation. To this end I provide spraying booths pro vided withsuitable air filters so that the air is drawn from the back of the spraybooth taken over the top of the spray booth and discharged downwardly infront of the spray booth. This has numerous advantages aside fromcorrecting the difficulties already alluded to. One of these advantagesis that the filtered air is discharged directly on top of the workman infront of the booth adding to his comfort, and is discharged in such away that it tends to keep t-he spray back from the front of the boothand away from the workman. These and other features will be describedafter a description of the various parts has been given.

In the drawings:

Fig. 1 is a vertical section through the painting booth.

Fig. 2 is a section fragmentary in character taken from a 90 degreepoint ,from the section shown in Fig. 1.

Fig. 3 is a plan View of the booth.

Fig. 4 is a fragmentary horizontal section through the air duct.

Fig. 5 is a section taken on the line 5 5 of Fig. 3. Y

The painting booth is preferably construe-ted of sheet metal and is ashell, the

details of which need no specific descrip-- tion. The idea is to providea large air duct a at the top of the booth; the duct connectswith an11p-going flue b; this upgoing flue communicates at the front and bottomwith the interior of the booth by means of sectional air filters c.These sectional air filters are preferably mineral wool covered withsome kind of oil which will absorb fumes, such in particular asturpentine fumes, and the mineral wool is packed in thick enough toarrest the passage of any paint spray. The air duct convergesv from theback towards the center and diverges from the center toward the frontwhere it terminates in a. downwardly opening hood d directly over thefront of the booth and over the attendant. At the converging centralportion is provided a fan and propeller e driven by suitableconnections.

The body can be rolled in on a truck sprayed and the spray and the fumeswill be sucked up through the filter, thence through the fan and the airdischarged l Leoaeeaa down over the workman and in front of the booth.This will prevent the heat losses that occurred heretofore and in no wayinterfere with the heat conditions and the Ventilating' conditions inth-e rest of the room. Furthermore, a fan can be located directly in theVentilating line without getting ummed up with 1nt. Thelter can be dailytaken out an cleaned and 1t will be found only necessary however, toclean two'filters a day.l The serious fire hazard that has heretoforeobtained due to the .flues with large paint accumulations thereinrunning for great lengths through the building, has been entirelyeliminated. What I claim is:

1. In a paint booth, the combination of a Aside of the chamber fromwhich it is again re-circulated laterally through the booth,- andmeansfor forcing the air through the air conduit.

2. In a painting booth, the combination of a shell forming a paintingchamber, and an air duct for taking the air at one side of the chamberand discharging it at another s'ide of the chamber from which it isre-circulated laterally through the booth, means for forcing the airthrough such air duct, and means for filtering the air passing throughsuch duct.

3. In a painting booth, the combination of a shell forming an airchamber, and an air duct leading from the rear of the shell over the topand discharging it in front of the booth from which it is re-circulatedlaterally through the booth, a fan for propelling the air through saidduct, and a filter near the intake of the duct for filtering the air andeliminating the fumes of the paint spray.

4. In a painting booth, the combination of a shell forming a paintingchamber with air open front, and an air duct leading fromtherear of thechamber up over the top and discharging through a hood at the open frontof the chamber, a fan for propelling the air `laterally through' saidchamber, and remov- Vhavingan up-going flue and a converging anddiverging flue acrossl the top of the chamber with a narrow portion nearthe center, said flue` discharging at the said open front, a fan'located at the narrow portlon, znd a filter near the intake of theup-going 6. In a painting booth, the combination of a shell providedwith an open front and forming a spra 'ng chamber and an air ductleading from t e rear of the chamber over the top where it converges anddiverges with a narrow central portion and terminates with anoverhanging discharge hood .above the said open front of the booth, afan located at the narrow portion, and removable filter sections locatedat the intake at the rear.

' 7. In a painting booth', the combination of a shell provided with anopen front and affording a painting chamber and an air duct in the formof an upgoing iiue at the rear, a fiue passing over the top of thechamber and converging toward the center and diverging toward the frontto form a narrow restricted portion and discharging at the front of thebooth inan overhang'ing hood, a fan located in the restricted portion,and a lter locate at the intake in the rear. v

8. In a paint booth, the combination of a shell including a paintingchamber, an air duct for taking the air from the upper rear portion ofsaid chamber and conducting it to the front of the chamber and directingthe same downwardly on the workman, means for filtering the air, andmeans for providing a forced re-circulation of the air through the boothand airy duct. whereby the air is forced downwardly on the workman andpassed laterally through the booth away from the workman.

In testimony whereof I aiix my signature.

FRED P. BINGMAN.

